Implements `PoV` export and local validation #3976

Job	Run time
set-image	8s
check-dependency-rules	8s
check-workspace	18s
check-markdown	14s
check-rust-feature-propagation	1m 55s
check-toml-format	1m 3s
fmt	1m 15s
check-umbrella	2m 17s
test-rust-features	1m 59s
	9m 17s

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